improve: show whole-diff totals alongside file stats

tests/unit/chrome.rs

@@ -77,6 +77,9 @@ fn omitted_options_inherit_and_explicit_groups_replace_defaults() {
 
 #[test]
 fn both_positions_accept_all_builtins_and_custom_styles() {
+    let defaults = ChromeLine::top();
+    assert_eq!(defaults.right, ["diff", "shell", "battery"]);
+    assert_eq!(defaults.segment("diff"), defaults.segment("shell"));
     let names = [
         "tabs",
         "mode",
@@ -90,6 +93,7 @@ fn both_positions_accept_all_builtins_and_custom_styles() {
         "lsp",
         "position",
         "battery",
+        "diff",
         "workspace",
     ];
     let options = serde_json::json!({
@@ -119,7 +123,7 @@ fn both_positions_accept_all_builtins_and_custom_styles() {
 }
 
 #[test]
-fn view_placeholder_is_valid_in_every_segment_and_bar() {
+fn comparison_placeholders_are_valid_in_every_segment_and_bar() {
     for name in [
         "tabs",
         "mode",
@@ -133,11 +137,12 @@ fn view_placeholder_is_valid_in_every_segment_and_bar() {
         "lsp",
         "position",
         "battery",
+        "diff",
         "workspace",
     ] {
         let options = serde_json::json!({
             "left": [name],
-            (name): {"title": "{index}:{view}{name}:{path}{modified}"}
+            (name): {"title": "{index}:{view}{name}{changes}:{path}{modified}"}
         });
         let lines: Lines = serde_json::from_value(serde_json::json!({
             "top": options,
@@ -147,7 +152,7 @@ fn view_placeholder_is_valid_in_every_segment_and_bar() {
         for line in [&lines.top, &lines.bottom] {
             assert_eq!(
                 line.segment(name).title,
-                "{index}:{view}{name}:{path}{modified}"
+                "{index}:{view}{name}{changes}:{path}{modified}"
             );
         }
     }